Post Holdings Inc., a cereal maker, is continuing its acquisition spree by buying a Canadian peanut butter producer Golden Boy Foods Ltd. and a nutritional supplements maker Dymatize Enterprises LLC in two separate deals totaling $680 million, to help expand its store-brand and nutrition businesses.

Post, which has been acquisitive recently, is purchasing Golden Boy, a maker of peanut butter and other nut butters from investors led by private-equity firm Tricor Pacific Capital Inc. for $320 million Canadian dollars (US$300 million). Golden Boy, which has three plants in Canada and two in the U.S., had net sales of C$164 million during the nine-month period ended Sept. 30.

Post expects to combine Golden Boy with its pending Dakota Growers Pasta Co. acquisition, which is expected to close in January. The combined company will be led by Golden Boy Chief Executive Richard Harris. The Golden Boy deal is expected to close about Feb. 1.

Post agreed to acquire Dymatize from investors led by private-equity firm TA Associates for $380 million. The company also agreed to pay up to $17.5 million in milestone payments for the maker of protein powders, bars and nutritional supplements. Dymatize will continue to be led by current President and CEO Greg Venner.